Allright, first step. Write down all of your modifications to date. See what will adapt new parts to it, and leave what wont. There is no point in saving up for a new blower/turbo if you dint have the right intake or heads. For the now, I would keep towards the heads, the exhaust, the intake and the ignition. When they are all set up properly, and your engine is capable of handling 900HP(Forged crank/Iron psitons/File-Fit rings) then go for it. Untill then, just keep working towards having a Bulletproof engine.